Solve this equation for a:
a + [ 11 17 -8 13] = [0 1 -2 3]

[-11  -16   6  -1]

Step-by-step explanation:

A must be a 1 by 4 matrix, since the two matrices given are 1 x 4.

The first element of A must be -11, since then -11 + 11 = 0.

The second element of A must be -16, since then 17 - 16 = 1.

The third element of A must be +6, since then -8 + 6 = -2.

Finally, the fourth element of A must be -10, since then -10 + 13 = 3.

Thus, 1 by 4 matrix A is [-11  -16   6  -1].

the answer would be a 24

step-by-step explanation:

c=2πr=2·π·3=24